2003 4.0 Engine Noise?

[duaneaaron]

Hey everyone! New Explorer owner here. Just picked up an 03 XLT with 159k from a buddy last week.

A couple days into driving it I started having this noise appear (see video).

https://www.dropbox.com/s/nl3qdtn40hr02dj/IMG_1409.MOV?dl=0

I was pretty sure it was a pulley.

So far I have replaced the idler pulley, tensioner, and water pump. Compressor was recently replaced as well.

Anyone have any idea? The noise stops if I spray the belt with brake cleaner (just discovered that tonight). Could it possibly be a belt?

Thanks in advance!

 

[odinjunior]

Spraying anything on the Belt acts as a lubricant. Causes of the noise can be an old belt or misaligned pulleys.

 

[TechGuru]

The only belt I use on everything, "The Quiet Belt", was called GoodYear Gatorback before Continental bought them.

Designed for quiet performance, constructed for high efficiency and built with track-to-street technology.

Elite® belts deliver:

• Quiet Channel Technology™: A unique staggered "Helicog" profile with advanced EPDM rubber compounds virtually eliminate chirps, squeaks and squeals associated with pulley misalignment.
• Greater wear resistance: High-strength tension members are specially treated to maintain tension, resulting in controlled elongation.
• Exceptional belt life: Elite® is more flexible and runs cooler, resulting in a belt that lasts considerably longer than comparable belts.

http://www.rockauto.com/en/moreinfo.php?pk=1332875